Improvement in tubular abridges



G. E. KING. Tubular Bridges.

No. 196,154.. Patented Oct. 16, I871 ATTORNEYS.

N.PE|'ERS, FHOTO-LITHQGRAPHER. WASHINGTON. Dv Q UNITED STATESGEORGE-Entire, or nEs MoIfNEs, IOWA.

IMPROVEMENT IN TUBULAR BRIDGES.

Specification forming part of Letters Patent No. 196,154, dated October16, 1877; application filed August 3, 1877.

To all whom it may concern:

Be it known that I, GEORGE E. KING, of Des Moines, in the county of Polkand State .of Iowa, have invented a new and useful Imtubular arches; andthe nature of my invention and improvement consists in connecting theposts, counter braces, and the lateral braces to a tubular arch by meansof pins, bolts, or rivets passed through angle-irons rigidly secured tothe arch, and also through eyes formed on the posts and braces, as willbe hereinafter explained.

In the annexed drawing, Eigure 1 is a side view of the section of atubular arch. Fig. 2 is an end view.

Similar letters of reference indicate corresponding parts.

The tubular arch is composed of channeled iron plates A A and flatplates B B, rigidly and closely bolted or riveted together, so as toexclude moisture from the inside. To-the bottom side of this tube Irigidly bolt or rivet angle-irons G G, having the form of the letter L.The vertical portions of these angle-irons form parallel flanges,between which the upper ends of the posts and bracerods D are secured bymeans of pins, bolts, or rivets (I, passed through eyes b.

Prior to my invention the posts and bracerods were secured to thetubular arch by passing them through the tube, and using nuts andwashers or shoulders. 'This weakened the tube, and involved safetydevices for preventing. the nuts from working loose. Furthermore, thetube was weakened by perforating it, and the perforations allowed waterto enter therein, which soon rusted and weakened it.

By my invention the tube is not weakened, nor so perforated thatmoisture can enter between the joints of the plates.

The drawing shows the angle-iron O 0 se- GEORGE ELIAS KING.

Witnesses ALBERT M. BLODGETT, ALBERT H. PORTER.

.TTEN QFFIGE.

